1378213 has 6 divisors (see below), whose sum is σ = 1422834. Its totient is φ = 1334016.

The previous prime is 1378199. The next prime is 1378217. The reversal of 1378213 is 3128731.

It can be written as a sum of positive squares in 3 ways, for example, as 161604 + 1216609 = 402^2 + 1103^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1378213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7045 + ... + 7237.

It is an arithmetic number, because the mean of its divisors is an integer number (237139).

2^1378213 is an apocalyptic number.

It is an amenable number.

1378213 is a deficient number, since it is larger than the sum of its proper divisors (44621).

1378213 is an frugal number, since it uses more digits than its factorization.

1378213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 230 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 1378213 is about 1173.9731683476. The cubic root of 1378213 is about 111.2855510671.

The spelling of 1378213 in words is "one million, three hundred seventy-eight thousand, two hundred thirteen".